MySQL按月分表，PHP如何做汇总统计查询、排序、分页
需求背景
群组表
group
聊天记录表
按月分表，如
chat_message_2015_04
chat_message_2015_05
chat_message_2015_06
表结构
chatTime //message时间
groupID //组ID
需求描述
- 给定一个时间段，如当天/最近7天/当月/2015-04-12 ~ 2015-06-17，统计给定时间段内各个group的message数量
- 按照统计出来的message数量，对group进行排序与分页输出
回复内容：
需求背景
群组表
group
聊天记录表
按月分表，如
chat_message_2015_04
chat_message_2015_05
chat_message_2015_06
表结构
chatTime //message时间
groupID //组ID
需求描述
- 给定一个时间段，如当天/最近7天/当月/2015-04-12 ~ 2015-06-17，统计给定时间段内各个group的message数量
- 按照统计出来的message数量，对group进行排序与分页输出
1、UNION
2、若是innodb分表，则可以用merge处理。
直接搞一张专门针对统计数据用的汇总表
如果可能的话，不要采用分表的设计，采用表分区，这样就对于查询就不需要特殊处理了。规划好索引，性能应该不会有问题。
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